fix sign message not accept rich text (#5210)
fix sign message not accept rich text (#5210)

* fix sign message not accept rich text

* set no rich also to signature/encrypt msg/encrypted fields

wakiyamap/electrum-mona,pooler/electrum-ltc,wakiyamap/electrum-mona,vialectrum/vialectrum,wakiyamap/electrum-mona,spesmilo/electrum,vialectrum/vialectrum,spesmilo/electrum,spesmilo/electrum,spesmilo/electrum,pooler/electrum-ltc,neocogent/electrum,fujicoin/electrum-fjc,pooler/electrum-ltc,pooler/electrum-ltc,fujicoin/electrum-fjc,neocogent/electrum,neocogent/electrum,vialectrum/vialectrum,wakiyamap/electrum-mona,fujicoin/electrum-fjc